How many InDesign points to a milimeter? (and mm to pt)

Question

What's the conversion between InDesign's point measurement (as used in leading and text size etc) and millimetres? What's the pt : mm ratio?

I've seen sources suggesting that a point is 1/72 of an inch, and an inch is 25.4mm, so in theory a point would be 0.3528mm and a millimetre would be 2.8346 pts, but I'd like something authoritative as I might well have gone wrong somewhere there.

2014/05/16
1
1
5/16/2014 3:56:00 PM

1 pt is equal to

0.08333 picas

0.01389 inches

0.3528 mm (millimeters)

one nice feature in basically all of adobe's software is that it can do those conversions for you. You can simply type in any of the unit of measure and it will even do basic math for you too like +2mm

2014/05/16
4
5/16/2014 6:43:00 PM

"Points" in typography e.g. in Indesign, Illustrator, Photoshop etc are "PostScript points" and, helpfully, they're a unit Google converts on searches like points to mm or mm to points.

Has to be `points` or `postscript points`, not `pts` or anything involving software names.

One point is 0.352777778 millimetres.

One millimetre is 2.83464567 PostScript points.

2014/05/16